155665066 has 8 divisors (see below), whose sum is σ = 234683460. Its totient is φ = 77437248.

The previous prime is 155665061. The next prime is 155665067. The reversal of 155665066 is 660566551.

It can be written as a sum of positive squares in 2 ways, for example, as 116964225 + 38700841 = 10815^2 + 6221^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×155665066² = 48463225545568712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155665061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197151 + ... + 197938.

Almost surely, 2^155665066 is an apocalyptic number.

155665066 is a deficient number, since it is larger than the sum of its proper divisors (79018394).

155665066 is a wasteful number, since it uses less digits than its factorization.

155665066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395288.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 155665066 is about 12476.5807014582. The cubic root of 155665066 is about 537.9357242762.

The spelling of 155665066 in words is "one hundred fifty-five million, six hundred sixty-five thousand, sixty-six".